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Summary of Debt Obligations (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Net Debt Issuances/Maturities
Dec. 31, 2011
Early Termed Interest Rate Swaps
Fair Value Adjustments on Hedges and Derivative Contracts
Debt Disclosure [Line Items]        
2012 $ 366.6      
2013 1,026.0      
2014 737.9      
2015 656.3      
2016 2,158.6      
Thereafter 7,499.1      
Reclassification to Long Term Debt 1,500      
Amounts outstanding 12,500.4 [1] 11,505.3 [1]   0.5
Increase (Decrease) in debt obligations     $ 1,000  
[1] Includes notes payable, current maturities of long-term debt and long-term debt included on the Consolidated balance sheet. The increase in debt obligations from December 31, 2010 to December 31, 2011 was primarily due to net issuances of $1.0 billion.